Computer will not boot from CD or any other hard drive
So I have this laptop I've been asked to reformat and install snow leopard. However, I cannot seem to get it to boot from the CD or any hard drive except the original hard drive. It still has OSX snow leopard 10.6 and it boots fine but the user just wants it wiped. I've removed the efi password (there was none) but I blanked it using the snow leopard disc through safe mode. If attempt to boot from any other device other than the original hard drive, I just get the gray apple logo screen and it will hang in there forever. Anyone got any ideas?
I reset the pram, disabled any security, etc I'm out of ideas now. thanks